Negative pressure unit



This invention was made with government support under ContractFA8650-13-12-6372 awarded by the Department of the Air Force. Thegovernment has certain rights in the invention.

FIG. 1 is an top front perspective view of a negative pressure unitshowing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an top rear perspective view thereof.

The broken lines in the drawings illustrate portions of the negativepressure unit that form no part of the claimed design.

CLAIM The ornamental design for a negative pressure unit, as shown anddescribed.